Refactor handout.typ

Reviewed-on: #7
Co-authored-by: Mark <mark@betalupi.com>
Co-committed-by: Mark <mark@betalupi.com>

lib/typst/local/handout/0.1.0/header.typ

@@ -0,0 +1,71 @@
+#import "misc.typ": ored
+
+#let solution_warning() = {
+  set text(ored)
+  align(
+    center,
+    block(
+      width: 60%,
+      height: auto,
+      breakable: false,
+      fill: rgb(255, 255, 255),
+      stroke: ored + 2pt,
+      inset: 3mm,
+      (
+        align(center, text(weight: "bold", size: 12pt, [Instructor's Handout]))
+          + parbreak()
+          + align(
+            left,
+            text(
+              size: 10pt,
+              [
+                This handout contains solutions and notes. \
+                Recompile without solutions before distributing.
+              ],
+            ),
+          )
+      ),
+    ),
+  )
+}
+
+#let make_header(
+  title,
+  subtitle: none,
+  by: none,
+  top_left: "",
+  top_right: "",
+) = {
+  let date = datetime
+    .today()
+    .display("[month repr:long] [day padding:none], [year]")
+
+  if (by != none) {
+    by = text(size: 10pt, [Prepared by #by on #date])
+  }
+
+  // Main title
+  align(
+    center,
+    block(
+      width: 60%,
+      height: auto,
+      breakable: false,
+      align(
+        center,
+        stack(
+          spacing: 7pt,
+          // Top
+          text(size: 10pt, top_left) + h(1fr) + text(size: 10pt, top_right),
+          line(length: 100%, stroke: 0.2mm),
+          // Title
+          text(size: 20pt, title),
+          // Subtitle
+          if (by != none) { text(size: 10pt, by) },
+          if (subtitle != none) { text(size: 10pt, subtitle) },
+          line(length: 100%, stroke: 0.2mm),
+        ),
+      ),
+    ),
+  )
+}